diff options
Diffstat (limited to 'lib/sqlalchemy/orm/evaluator.py')
| -rw-r--r-- | lib/sqlalchemy/orm/evaluator.py | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/lib/sqlalchemy/orm/evaluator.py b/lib/sqlalchemy/orm/evaluator.py index aff6718d3..3f2a83a02 100644 --- a/lib/sqlalchemy/orm/evaluator.py +++ b/lib/sqlalchemy/orm/evaluator.py @@ -7,6 +7,8 @@ import operator from ..sql import operators +from .. import inspect +from .. import util class UnevaluatableError(Exception): @@ -59,9 +61,17 @@ class EvaluatorCompiler(object): ) key = parentmapper._columntoproperty[clause].key else: - raise UnevaluatableError( - "Cannot evaluate column: %s" % clause - ) + key = clause.key + if self.target_cls and key in inspect(self.target_cls).column_attrs: + util.warn( + "Evaluating non-mapped column expression '%r' onto " + "ORM instances; this is a deprecated use case. Please " + "make use of the actual mapped columns in ORM-evaluated " + "UPDATE / DELETE expressions." % clause) + else: + raise UnevaluatableError( + "Cannot evaluate column: %s" % clause + ) get_corresponding_attr = operator.attrgetter(key) return lambda obj: get_corresponding_attr(obj) |